Line length measuring device and use method of line length measuring device for accurate laying out of line construction

Abstract

The present application provides a device for measuring the length of a line for accurate laying out of a line and a method for using the device. A laser transmitter emits a laser beam, and a beam splitter divides the laser beam into two laser signals. A first focusing mirror respectively transmits the two laser signals to the transmission line to be measured being laid out, so as to form two corresponding reflection signals. A second focusing mirror respectively reflects the two reflection signals to a photoelectric detector. The photoelectric detector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to a second processor. The second processor calculates the laying speed of the transmission line to be measured based on the optical path distance and transit time of the two laser signals, and sends the laying speed to the first processor. The first processor calculates the length of the transmission line to be measured based on the laying speed and the collected laying time. The device can complete the accurate measurement of the laying length of the transmission line in a non-contact manner, greatly improving the efficiency of the line construction.

Description

Technical Field

[0001] The present application relates to the technical field of transmission line measurement, and in particular to a line length measurement device for accurate line length laying and line construction and a method for using the device. Background Art

[0002] Wireline construction is a very important link in power grid transmission projects, and it is particularly important to measure the length of transmission lines during wireline construction. The length of traditional transmission lines is measured by sag. Taking the assembled wireline construction technology as an example, the conductor is stretched out on the ground during construction, and the wire is laid out with precise length during wireline construction. After hanging the wire, the designed sag can be obtained. The traditional line length measurement uses the total station length measurement method. Two prisms need to be placed at the corresponding hanging points of two adjacent towers. The observer can measure the length of the line in the section by carrying the total station on his shoulder and running along with the line segment. However, this method requires the hanging prism, which is very inconvenient to operate, and the measurement is easily affected by external rain, fog, wind, etc., and the efficiency and accuracy are low. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a line length measurement device based on accurate line length deployment and a method of use thereof, so as to overcome the problems that the existing line length test and measurement method requires the removal of a hanging prism, which is very inconvenient to operate, and the measurement is easily disturbed by external rainy and foggy weather, wind, etc., resulting in low efficiency and accuracy.

[0004] In a first aspect, an embodiment of the present application provides a device for measuring the length of a line in construction based on accurate laying of a line, wherein the device is fixed on a laying-out pulley of any power grid tower, and the laying-out pulley is used to lay out a transmission line between power grid towers, and the device comprises: a laser emitting device, a laser receiving device, and a first processor; wherein the first processor is respectively connected to the laser emitting device and the laser receiving device;

[0005] The laser emitting device comprises a laser emitter, a beam splitter and a first focusing mirror connected in sequence; the laser receiving device comprises a photoelectric detector, a second focusing mirror and a second processor connected in sequence; the laser emitter and the photoelectric detector are respectively connected to the second processor, and the second processor is connected to the first processor;

[0006] The laser transmitter emits a laser beam, and the laser beam is split into two laser signals by the beam splitter;

[0007] The first focusing mirror respectively transmits the two paths of laser signals to the transmission line to be measured being deployed, so as to form two paths of reflected signals accordingly;

[0008] The second focusing mirror reflects the two reflection signals to the photodetector respectively; the photodetector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to the second processor;

[0009] The second processor calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and the transit time of the two laser signals collected, and sends the deployment speed to the first processor;

[0010] The first processor calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time.

[0011] In a second aspect, an embodiment of the present application provides a line length measurement system for accurately laying out a line for construction based on line length, the system comprising a monitoring computer terminal, a plurality of power grid towers, a line-laying pulley, and the line length measurement device for accurately laying out a line for construction based on line length as described in the first aspect above; wherein each of the line-laying pulleys is respectively arranged on each of the power grid towers, and each of the measuring devices is installed on each of the line-laying pulleys through a fixing device; the monitoring computer terminal is respectively connected to each of the measuring devices;

[0012] The monitoring computer controls the measuring device to measure the length of the transmission line.

[0013] In a third aspect, an embodiment of the present application provides a method for measuring the length of a transmission line using the line length measurement system based on accurate line length deployment and line construction described in the first aspect, the method comprising:

[0014] The monitoring computer sends a measurement instruction to any one of the laser transmitters, and the laser transmitter emits a laser beam, which is then split into two laser signals by the beam splitter;

[0015] The first focusing mirror respectively transmits the two paths of laser signals to the transmission line to be measured being deployed, so as to form two paths of reflected signals accordingly;

[0016] The second focusing mirror reflects the two reflection signals to the photodetector respectively; the photodetector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to the second processor;

[0017] The second processor calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and the transit time of the two laser signals collected, and sends the deployment speed to the first processor;

[0018] The first processor calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time, and sends the length of the transmission line to be measured to the monitoring computer end.

[0019] The embodiment of the present application provides a line length measurement device for accurately laying out the line construction based on the line length and its use method. When it is necessary to measure the line length of the transmission line, the laser transmitter emits a laser beam, and then the laser beam is divided into two laser signals through a beam splitter; the two laser signals are then respectively emitted to the transmission line to be measured being laid out through a first focusing mirror to form two corresponding reflection signals; the two reflection signals are then respectively reflected to the photoelectric detector through a second focusing mirror; the photoelectric detector receives the two reflection signals respectively, determines the transit time of the two reflection signals received, and sends the transit time to the second processor; the second processor calculates the laying speed of the transmission line to be measured being laid out according to the optical path distance and transit time of the two laser signals collected, and sends the laying speed to the first processor; the first processor calculates the line length of the transmission line to be measured according to the laying speed and the collected laying time. The device can complete the accurate measurement of the laying line length of the transmission line in a non-contact manner, greatly improving the efficiency of the line construction work, avoiding the dangerous operation of taking and hanging prisms at high altitude, and saving a lot of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a line length measurement device for line length accurate deployment and line construction provided by one embodiment of the present application;

[0022] Figure 2 A schematic diagram of the principle of power grid transmission line stringing provided by one embodiment of the present application;

[0023] Figure 3 A schematic diagram of the circuit structure of a photodetector provided in one embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of a line length measurement device for line length accurate deployment and line construction provided by another embodiment of the present application;

[0025] Figure 5 A structural diagram of a wire-laying pulley provided for one embodiment of the present application;

[0026] Figure 6A schematic diagram of the structure of a line length measurement system for line length accurate deployment and line construction provided by an embodiment of the present application;

[0027] Figure 7 A working principle diagram of a line length measurement system for line length accurate deployment and line construction provided in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] In order to explain the present application in more detail, a line length measurement device for accurate line length deployment and a method of using the line length measurement device provided by the present application will be specifically described below in conjunction with the accompanying drawings.

[0030] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the line length measuring device for accurate laying out of line construction based on line length provided in an embodiment of the present application is shown. The measuring device is fixed on a line-laying pulley of any power grid tower, and the line-laying pulley is used to lay out the transmission line between the power grid towers. The device comprises: a laser emitting device 1, a laser receiving device 2 and a first processor 3; wherein the first processor 3 is respectively connected to the laser emitting device 1 and the laser receiving device 2; the laser emitting device 1 comprises a laser emitter 11, a spectrometer 12 and a first focusing mirror 13 connected in sequence; the laser receiving device 2 comprises a photodetector 21, a second focusing mirror 22 and a second processor 23 connected in sequence; the laser emitter 11 and the photodetector 21 are respectively connected to the second processor 23, and the second processor 23 is connected to the first processor 3 ... The emitter 11 emits a laser beam, and the laser beam is divided into two laser signals by the beam splitter 12; the first focusing mirror 13 respectively transmits the two laser signals to the transmission line to be measured being deployed, so as to form two corresponding reflection signals; the second focusing mirror 22 respectively reflects the two reflection signals to the photodetector 21; the photodetector 21 respectively receives the two reflection signals, determines the transit time of the two reflection signals received, and sends the transit time to the second processor 23; the second processor 23 calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and transit time of the two laser signals collected, and sends the deployment speed to the first processor 3; the first processor 3 calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time.

[0031] In an optional implementation, the number of the photodetectors 21 may be two.

[0032] Please refer to Figure 2 As shown, Figure 2 This is a schematic diagram of the power transmission line erection, including multiple power towers. The transmission line is erected between two power towers. It is usually automatically erected using a wire-laying pulley, that is, the wire-laying pulley is arranged according to Figure 2 The transmission network is set up in the direction of the conductor pulling and spreading, thereby completing the line stringing; wherein the measuring device is installed on the wire laying pulley of the power grid tower (i.e. Figure 2 The working point of the measuring device in the transmission line). The transmission line length measurement usually refers to the measurement of the length of the transmission line between any two power grid towers, also known as the in-line length. Since in this embodiment, the length of the transmission line is measured during the erection (or deployment) of the transmission line, and the transmission line is in motion at this time, the length of the transmission line cannot be directly measured; therefore, in this embodiment, the length of the transmission line is calculated by measuring the deployment speed of the transmission line and the deployment time of the line-laying pulley on the transmission line.

[0033] In measuring the deployment speed of the transmission line, a non-contact laser test method is used, and the transmission line to be measured is recorded as the transmission line to be measured being deployed; the specific process is: when the deployment speed of the transmission line to be measured being deployed needs to be measured, a laser transmitter 11 is used to generate a laser beam, and the beam splitter 12 divides the laser light speed into two laser signals, and the two laser signals are respectively transmitted to the transmission line to be measured being deployed through the first focusing lens 13; the two laser signals are respectively transmitted to the transmission line to be measured being deployed, and reflected waves are respectively formed, that is, two reflected signals are formed. The two reflected signals pass through the second focusing lens 22 and enter the two photodetectors 21 respectively. Since the optical paths of the two laser signals are different and the positions of the transmission line to be measured are different, the optical paths of the two reflected signals formed are also different, so there will be a time difference between the time when the two photodetectors 21 receive the reflected signals, that is, the transit time. In addition, the optical paths of the two laser signals are different and have an optical path distance. The optical path distance and the transit time are sent to the second processor 23, and the second processor 23 can calculate the movement speed (i.e., the deployment speed) of the transmission line to be measured based on the optical path record and the transit time and the laser velocity measurement principle model. The laser velocity measurement principle model is determined in the following way: the parameter values ​​involved in the model are: S0: the distance between the two optical paths emitted by the beam splitter 13; T 0 : The transit time when the two photodetectors 21 receive the relevant signals; V: The moving speed of the transmission line to be measured.

[0034]

[0035] The transit time processing in the laser speed measurement principle model uses random theory to analyze the optical path signal. After splitting, the similarity of the two signal waveforms is compared at different delay values. The transit time is calculated by integrating autocorrelation analysis into the traditional cross-correlation function method. Among them, the specific theoretical logic for determining the transit time is: if the first laser signal is analyzed as the input signal, it is the signal of a stationary random process; then the second laser signal is the output signal of a linear function with a pulse response. In terms of random theory, these two laser signals are the correlations of two different random processes at different times. The logic expressed by a mathematical function is: if the random signals of the two laser signals are regarded as x(t) and y(t), the difference between the two is a transit time τ 0 , then the correlation function R xy (r) can be given by convolution:

[0036]

[0037] Since the signals of the two photodetectors 21 are identical, and differ only by a transit time, the second laser signal can be regarded as a transit time delay τ 0 The pulse signal g(t);

[0038] g(t)=δ(t 0 -τ 0 )

[0039] The two formulas are combined to get

[0040] R xy (τ) = R xx (τ-τ 0 )

[0041] Or written as the autocorrelation function with time t, t = τ 0 The peak value appears at , which is the transit time.

[0042] R xy (τ)=kδ(t 0 -τ 0 )

[0043] In the above laser signal transit time processing: x(t) and y(t) are random signals of two laser beams; R xy (r) is the correlation function of two random signals; τ 0 is the transit time; τ is the time between any two time points of the two signals in the correlation function; t is the time of the random signal; g(t) is the delayed pulse signal; k is the integral of the delayed pulse signal; δ is the pulse signal.

[0044] The first processor 3 can calculate the length of the transmission line to be measured according to the deployment speed of the transmission line to be measured and the deployment time of the transmission line. The specific calculation formula is: s = Vt, where s represents the length of the transmission line to be measured; V represents the deployment speed of the transmission line to be measured; t represents the deployment time.

[0045] In an optional implementation, the laser transmitter 11 may be a semiconductor laser circuit, the optical splitter 12 may be a SMA905 optical splitter, which may support full-band signal output of 1260 to 1650 nm, and the first processor 3 may be a microprocessor STM32F030R8T6TRST.

[0046] In a preferred embodiment, the photodetector 21 can be a high-speed photoelectric balanced detector of U2T BPRV2125A40G rate, dual-fiber differential output, bandwidth 31GHz, capable of detecting most optical path information, and outputting voltage swing 600mV information to the preprocessor. The first processor 23 can be a microprocessor STM32F030R8T6TRST, the internal integrated circuit can execute the functions of the control component and the arithmetic logic component to cooperate with the external memory to exchange the wire deployment speed information. Among them, the circuit structure of the photodetector is as follows Figure 3 shown.

[0047] The line length measuring device for line stringing construction based on accurate line length deployment provided in the embodiment of the present application can accurately measure the line length of the transmission line in a non-contact manner, greatly improving the efficiency of line stringing construction, avoiding dangerous high-altitude prism hanging operations, and saving a lot of manpower and material resources.

[0048] In one embodiment, the laser emitter, the beam splitter and the first focusing mirror form a first cylindrical structure; the photodetector, the second focusing mirror and the second processor form a second cylindrical structure.

[0049] In one embodiment, a shell 10 is further included; the first cylindrical structure, the second cylindrical structure and the first processor are respectively arranged inside the shell.

[0050] Specifically, please refer to 1 and 4, the measuring device includes a housing 10, a laser emitter, a beam splitter and a first focusing mirror form a first cylindrical structure; a photodetector, a second focusing mirror and a second processor form a second cylindrical structure, and the first cylindrical structure and the second cylindrical structure are both installed or arranged inside the housing 10. This method is convenient for the generation and recovery feedback of laser.

[0051] In addition, the first cylindrical structure and the second cylindrical structure can also be called a non-contact laser length measurement system.

[0052] In one embodiment, please refer to Figure 1and Figure 4 As shown, the device further includes an inclination sensor 14; the inclination sensor 14 is disposed at the front end of the housing 10; the inclination sensor 14 is connected to the first processor 3 to transmit data.

[0053] Further, the inclination sensor 14 may be a SCL3300-D01-10 SCL3300-D01 three-axis inclination sensor.

[0054] Among them, the inclination sensor is also called inclinometer, inclinometer, level, inclinometer, which is often used to measure the horizontal angle change of the system. The level has evolved from the simple bubble level in the past to the electronic level, which is the result of the development of automation and electronic measurement technology. As a detection tool, it has become an indispensable and important measuring tool in the fields of bridge erection, railway laying, civil engineering, oil drilling, aviation and navigation, industrial automation, intelligent platform, mechanical processing, etc. The electronic level is a very accurate detection tool for measuring small angles. It can be used to measure the inclination of the measured plane relative to the horizontal position, the parallelism and verticality of the two parts. In this embodiment, the inclination sensor is mainly used to detect the inclination of the measuring device when it is tilted during use, so that it is easy to adjust in time when the inclination is too large to avoid inaccurate measurement results.

[0055] In one embodiment, a fixing device 8 is disposed on a side wall of the housing 10 .

[0056] Please refer to Figure 1 and 4 As shown, a fixing device 8 can be provided on the left and right side walls of the housing 10, and the number of the fixing devices 8 can be multiple. The measuring device can be installed on the line-laying pulley through the fixing device 8. Figure 5 As shown, 40 is a wire-laying pulley, and the wire-laying pulley is provided with bolt holes 81 and 82. Optionally, the fixing device 8 can be a fixing hole, wherein both the fixing hole and the bolt hole can be installed with a screw, so as to install the measuring device at the working point where the wire-laying pulley is located.

[0057] In one embodiment, the device further includes a radio frequency communication module 6 ; the radio frequency communication module 6 is disposed inside the housing 10 , and the radio frequency communication module 10 is used to connect to a monitoring computer terminal.

[0058] Specifically, if Figure 1 and Figure 4 As shown, the device also includes a radio frequency communication module 6, through which it can communicate with the monitoring computer terminal on the ground, so that a data transmission channel can be established between the measuring device and the commander's computer terminal to achieve real-time transmission and monitoring of data such as wire length.

[0059] Optionally, the radio frequency communication module 6 can be a radio frequency card, which can establish a radio frequency identification system for the reader of the ground inspection monitoring computer. The radio frequency card uses an ordinary ISO-18000-6C (EPC G2) electronic tag, and the card reader uses a UHFRFID ultra-high frequency long-distance reader JT-8290G, which fully supports ISO-18000-6C (EPC G2) and ISO-18000-6B electronic tags; it can stably read information of objects within 20m.

[0060] In one embodiment, Figure 1 and Figure 4 As shown, the device further includes a power button 4 and a reset button 5; the power button 4 and the reset button 5 are arranged on the outer wall of the housing 10 through mounting holes.

[0061] In one embodiment, Figure 1 and Figure 4 As shown, one or more heat dissipation holes 7 are formed on the housing 10 .

[0062] Optionally, the device may further include a heat dissipation device, such as a heat dissipation fan, etc., which can help to dissipate heat between the laser emitting device and the laser receiving device.

[0063] Furthermore, the device also includes a power supply module, which can use a 3.2-3.7V / 3600mAh rechargeable lithium-ion battery UF103450PN to power the entire measurement device.

[0064] Based on the above-mentioned line length measurement device for accurate line length-based laying out of wires for construction, the embodiments of the present application also disclose a line length measurement system for accurate line length-based laying out of wires for construction corresponding to the above-mentioned device, and a specific embodiment is given below for detailed description.

[0065] See also Figure 6 , is a line length measurement system for line length accurate laying out and wiring construction disclosed in an embodiment of the present application, mainly comprising: comprising: a monitoring computer terminal, multiple power grid towers, a wire-laying pulley and a measuring device described in any one of the embodiments of the line length measurement device for line length accurate laying out and wiring construction; wherein each wire-laying pulley is respectively arranged on each power grid tower, and each measuring device is installed on each wire-laying pulley through a fixing device; the monitoring computer terminal is respectively connected to each measuring device; the monitoring computer terminal controls the measuring device to measure the line length of the transmission line.

[0066] Specifically, the radio frequency communication module of the measuring device can be used to establish communication between the measuring device on the pole tower and the monitoring computer on the ground under the pole tower. The commander under the tower can remotely control the measuring device through the monitoring computer to realize real-time transmission and monitoring of data such as wire length. When the line length is about to reach the design value, the computer control program responds to provide real-time early warning of wire deployment.

[0067] In addition, the length measurement principle of the line length measurement system based on the accurate deployment of the line length is as follows: Figure 7 shown.

[0068] Based on the above-mentioned line length measurement system for accurate line length deployment and line construction, the embodiment of the present application also discloses a method for measuring the line length of power grid transmission lines corresponding to the above-mentioned system, and a specific embodiment is given below for detailed description.

[0069] A method for measuring the length of a power transmission line using the system described in the above embodiment, the method comprising:

[0070] S1: The monitoring computer sends a measurement command to any laser transmitter, and the laser transmitter emits a laser beam, which is then split into two laser signals by a beam splitter.

[0071] S2: The first focusing mirror transmits two laser signals to the transmission line to be measured being deployed, so as to form two corresponding reflection signals.

[0072] S3: The second focusing mirror reflects the two reflection signals to the photodetector respectively; the photodetector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to the second processor.

[0073] S4: The second processor calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and transit time of the two laser signals collected, and sends the deployment speed to the first processor;

[0074] S5: The first processor calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time, and sends the length of the transmission line to be measured to the monitoring computer end.

[0075] Specifically, first determine the number of measuring devices according to the construction arrangement, and the number of each line length measuring device corresponds to each grid tower, that is, use a fixing device 8 and a line-laying pulley 40 designed with bolt holes 81 and 82 to fix the line length measuring device at the working point. Activate it through the monitoring computer terminal on the ground, establish a connection with the computer terminal, and let the measuring device standby. Then, lift the suspension insulator string and the line-laying pulley 40 with the line length measuring device installed; after the guide rope is deployed, the line length measuring device starts working, and uses the deployed traction rope to calibrate the working state of the line length measuring device and make adjustments; when the traction rope is deployed, the data of the line length measuring device is reset, and prepare to measure the length of the conductor. The specific measurement process is as S1 to S5.

[0076] The use of the above-mentioned measurement system can effectively solve the problem of construction personnel being unclear about construction data and construction degree during the construction of line stringing based on accurate line length. It can achieve real-time grasp of real-time construction data, and ground commanders can also organize operators to respond to high-altitude feedback at the first time. It eliminates the cumbersome observation process of observers using the total station method and real-time shouting with ground commanders, greatly improving the efficiency of line stringing construction, avoiding dangerous high-altitude prism hanging operations, and saving a lot of manpower and material resources. The data returned by the length measuring device on the tower can easily determine whether the line-laying pulley is working properly, and the ground commander can organize adjustment measures at the first time. When the data returned by the measuring device on the power grid tower is about to reach the design value, the early warning program on the computer side will work, reminding the ground commander to pay attention to the completion of the transmission line deployment, thereby improving construction efficiency and safety.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0078] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring the length of a line for accurate laying out of a line, characterized in that: The measuring device is fixed on a wire-laying pulley of any power grid tower, and the wire-laying pulley is used to lay out the transmission line between the power grid towers. The device comprises: a laser emitting device, a laser receiving device and a first processor; wherein the first processor is respectively connected to the laser emitting device and the laser receiving device; The laser emitting device comprises a laser emitter, a beam splitter and a first focusing mirror connected in sequence; the laser receiving device comprises a photoelectric detector, a second focusing mirror and a second processor connected in sequence; the laser emitter and the photoelectric detector are respectively connected to the second processor, and the second processor is connected to the first processor; The laser transmitter emits a laser beam, and the laser beam is split into two laser signals by the beam splitter; The first focusing mirror respectively transmits the two paths of laser signals to the transmission line to be measured being deployed, so as to form two paths of reflected signals accordingly; The second focusing mirror reflects the two reflection signals to the photodetector respectively; the photodetector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to the second processor; The second processor calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and the transit time of the two laser signals collected, and sends the deployment speed to the first processor; The first processor calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time; The laser emitter, the beam splitter and the first focusing mirror form a first cylindrical structure; The photodetector, the second focusing mirror and the second processor form a second cylindrical structure; The device further comprises a housing; the first cylindrical structure, the second cylindrical structure and the first processor are respectively arranged inside the housing; The device further comprises an inclination sensor; the inclination sensor is arranged at the front end of the shell; the inclination sensor is connected to the first processor.

2. The device according to claim 1, characterized in that A fixing device is arranged on the side wall of the shell.

3. The device according to claim 1, characterized in that It also includes a radio frequency communication module; the radio frequency communication module is arranged inside the shell, and the radio frequency communication module is used to connect to the monitoring computer terminal.

4. The device according to claim 2, characterized in that It also includes a power button and a reset button; the power button and the reset button are arranged on the outer side wall of the shell through a through hole.

5. The device according to claim 1, characterized in that The shell is provided with one or more heat dissipation holes.

6. A line length measurement system for accurate line length deployment and line erection construction, characterized in that: include: A monitoring computer terminal, a plurality of power grid towers, a wire-laying pulley, and a wire length measuring device for accurately laying out a wire based on wire length according to any one of claims 1 to 5; wherein each of the wire-laying pulleys is respectively arranged on each of the power grid towers, and each of the measuring devices is installed on each of the wire-laying pulleys through a fixing device; and the monitoring computer terminal is respectively connected to each of the measuring devices; The monitoring computer controls the measuring device to measure the length of the transmission line.

7. A method for using the line length measurement system for line length accurate deployment and line erection construction according to claim 6, characterized in that: The method comprises: The monitoring computer sends a measurement instruction to any one of the laser transmitters, and the laser transmitter emits a laser beam, which is then split into two laser signals by the beam splitter; The first focusing mirror respectively transmits the two paths of laser signals to the transmission line to be measured being deployed, so as to form two paths of reflected signals accordingly; The second focusing mirror reflects the two reflection signals to the photodetector respectively; the photodetector receives the two reflection signals respectively, determines the transit time of the two reflection signals, and sends the transit time to the second processor; The second processor calculates the deployment speed of the transmission line to be measured being deployed according to the optical path distance and the transit time of the two laser signals collected, and sends the deployment speed to the first processor; The first processor calculates the length of the transmission line to be measured according to the deployment speed and the collected deployment time, and sends the length of the transmission line to be measured to the monitoring computer end.

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